A couple has two sons and two daughters. Only one son is colour blind

1.	A couple has two sons and two daughters. Only one son is colour blind and the rest of the siblings are normal. Assuming colour blindness is sex-linked, which ONE of the following would be the phenotype of the parents ? (A) Mother would be colour blind, father would be normal.(B) Father would be colour blind, mother would be normal. (C) Both the parents would be normal. (D) Both the parents would be colour blind.
Answer» Correct Option :- (C) Both the parents would be normal. Explanation :- Male child recieve X-chromosome from mother only. Another normal son indicates that mother is carrier.

A couple has two sons and two daughters. Only one son is colour blind and the rest of the siblings are normal. Assuming colour blindness is sex-linked, which ONE of the following would be the phenotype of the parents ? (A) Mother would be colour blind, father would be normal.(B) Father would be colour blind, mother would be normal. (C) Both the parents would be normal. (D) Both the parents would be colour blind.

Answer»

Correct Option :- (C) Both the parents would be normal.

Explanation :-

Male child recieve X-chromosome from mother only. Another normal son indicates that mother is carrier.

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